Surprise Lake
Lake County, Minnesota38 acresView mapDirections
No nutrient or algae sampling on record from Minnesota PCA for this lake.
- Impaired · Mercury
Surprise Lake in Lake County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Surface area: 38 acres.
Surprise Lake is a 38-acre lake in Lake County, Minnesota.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder. Methodology: how these readings are compared.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Surprise Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
Whether Surprise Lake is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Surprise Lake
These are the measurements Minnesota PCA publishes for Surprise Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. TSI undefined.
Ask about Surprise Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
38 acres
Shoreline
1.2 mi
No bathymetric survey has been published for Surprise Lake, so its depth is not documented here.
Stays via Stay22
Stays near Surprise Lake
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Fishing Surprise Lake
EPA Impairment Status
Surprise Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
Designated uses not supporting: Fish consumption.
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN38-0550-00 · Official waterbody report
Nearby Lakes in Lake County
Frequently asked questions about Surprise Lake
Where is Surprise Lake?
- Surprise Lake is a lake in Lake County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Surprise Lake?
- Surprise Lake in Lake County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Surface area: 38 acres.
Is Surprise Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Surprise Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for mercury. Check local advisories before you swim.
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Where this data comes from
Measurements for Surprise Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake details from Minnesota DNR LakeFinder